- Insertion of molecular oxygen in transition-metal hydride bonds, oxygen-bond activation, and unimolecular dissociation of metal hydroperoxide intermediates
[作者：Schlangen, M; Schwarz, H,期刊：Helvetica Chimica Acta, 页码：379-386 , 文章类型： Article，,卷期：2008年91-3]
- Thermal activation of molecular oxygen is observed for the late-transition-metal cationic complexes [M(H)(OH)](+) with M = Fe, Co, and Ni. Most of the reactions proceed via insertion in a metal-hydride bond followed by t...
- Photocycloaddition reactions of 5,5-dimethyl-3-(3-methylbut-3-en-1-ynyl)cyclohex-2-en-1-one
[作者：Inhulsen, I; Kopf, J; Margaretha, P,期刊：Helvetica Chimica Acta, 页码：387-394 , 文章类型： Article，,卷期：2008年91-3]
- The title cyclohexenone Id undergoes photodimerization selectively at the exocyclic C=C bond to give a 1:1 mixture of 1,2-dialkynyl-1,2-dimethylcyclobutanes 6 and 7. On irradiation in the presence of 2,3-dimethylbuta-1,3...
- Synthesis, DNA-binding and photocleavage studies of the ruthenium(II) complexes [Ru(phen)(2)(ppd)](2+) and [Ru(phen)(ppd)(2)](2+) (ppd = pteridino[6,7-f] [1,10]phenanthroline-11,13(10H,12H)-dione, phen=1,10-phenanthroline)
[作者：Gao, F; Chao, H; Wei, YF; Yuan, YX; Peng, B; Chen, X; Zheng, KC; Ji, LN,期刊：Helvetica Chimica Acta, 页码：395-410 , 文章类型： Article，,卷期：2008年91-3]
- Two new complexes, [Ru(phen)(2)(ppd)](2+) (1) and [Ru(phen)(ppd)(2)](2+) (2) (ppd = pteridino[6,7-f] [1,10]phenanthroline-11, 13(10H,12H)-dione, phen=1,10-phenanthroline) were synthesized and characterized by ES-MS, H-1-...
- Stability of 7,8-dihydropterins in air-equilibrated aqueous solutions
[作者：Dantola, ML; Vignoni, M; Capparelli, AL; Lorente, C; Thomas, AH,期刊：Helvetica Chimica Acta, 页码：411-425 , 文章类型： Article，,卷期：2008年91-3]
- 6-Substituted 7,8-dihydropterins (= 2-amino-7,8-dihydropteridin-4 (1H)-ones) are heterocyclic compounds that occur in a wide range of living systems and participate in relevant biological functions. In air-equilibrated a...
- New sesquiterpene formamides from the marine sponge Axinyssa sp.
[作者：Lan, WJ; Wan, HP; Li, GX; Li, HJ; Chen, YY; Liao, CZ; Cai, JW,期刊：Helvetica Chimica Acta, 页码：426-434 , 文章类型： Article，,卷期：2008年91-3]
- Chemical investigation of an extract of the marine sponge Axinyssa sp., collected from the South China Sea, led to the isolation and identification of two new sesquiterpene formamides, (4R*,5R*,10R*)4-formamidoeudesm-7-e...
- Diels-Alder additions, ene reactions, and condensations of 4-(acylamino)-5-nitrosopyrimidines - Synthesis of 8-substituted guanines and of 6-substituted pteridinones
[作者：Steirlin, T; Vasella, A,期刊：Helvetica Chimica Acta, 页码：435-450 , 文章类型： Article，,卷期：2008年91-3]
- 4-(Acylamino)-5-nitrosopyrimidines react either by a reductive condensation to provide 8-substituted guanines, or by a Diels-Alder cycloaddition, or an ene reaction, to provide 6-substituted pteridinones, depending on th...
- Unusual nortriterpenoid saponines from Stauntonia chinensis
[作者：Gao, H; Wang, Z; Yao, ZH; Wu, N; Dong, HJ; Li, J; Wang, NL; Ye, WC; Yao, XS,期刊：Helvetica Chimica Acta, 页码：451-459 , 文章类型： Article，,卷期：2008年91-3]
- Four new saponins, yemuosides YM17-YM20(1-4, resp.), were isolated from the rattan of Stauntonia chinensis DC. (Lardizabalaceae) along with a known saponin, nipponoside D (5). Their structures were elucidated by spectros...
- Noroleanane triterpenoids from the aerial parts of Lantana camara
[作者：Begum, S; Zehra, SQ; Hassan, SI; Siddiqui, BS,期刊：Helvetica Chimica Acta, 页码：460-467 , 文章类型： Article，,卷期：2008年91-3]
- Two novel triterpenoids, lantadienone (1) and camaradienone (2), were isolated from the aerial parts of Lantana camara, along with seven known compounds, lantadene A, lantadene B, beta-sitosterot 3-(beta-D-glucopyranosid...
- Physicochemical profiling of sartans: A detailed study of ionization constants and distribution coefficients
[作者：Tosco, P; Rolando, B; Fruttero, R; Henchoz, Y; Martel, S; Carrupt, PA; Gasco, A,期刊：Helvetica Chimica Acta, 页码：468-482 , 文章类型： Article，,卷期：2008年91-3]
- A detailed investigation of the ionization and lipophilicity profiles of selected sartans (valsartan, losartan, irbesartan, candesartan, candesartan cilexetil), a class of antihypertensives commonly used in therapy, is p...
- New oxygenated lignans from Kadsura philippinensis
[作者：Shen, YC; Lin, YC; Cheng, YB; Chang, CJ; Lan, TW; Liou, SS; Chien, CT; Liaw, CC; Khalil, AT,期刊：Helvetica Chimica Acta, 页码：483-494 , 文章类型： Article，,卷期：2008年91-3]
- Seven new oxygenated lignans, kadsuphilins G-M (1 - 7, resp.), were isolated by chromatographic fractionation of an AcOEt extract of the aerial part of Kadsura philippinensis including four compounds with a dibenzocycloo...
- Three new glycosides from the stems of Miliusa balansae
[作者：Lei, Y; Wu, LJ; Shi, HM; Tu, PF,期刊：Helvetica Chimica Acta, 页码：495-500 , 文章类型： Article，,卷期：2008年91-3]
- Three new glycosides with the same saccharides, namely miliusoside A (1), miliusoside B (2), and miliusoside C (3), together with five known compounds were isolated from the stems of Miliusa balansae. Their structures we...
- Cytotoxic terpenoids from Turraea pubescens
[作者：Wang, XN; Fan, CQ; Yin, S; Lin, LP; Ding, J; Yue, JM,期刊：Helvetica Chimica Acta, 页码：510-519 , 文章类型： Article，,卷期：2008年91-3]
- Three new triterpenoids, turrapubesols A-C (1-3), and one new sesquiterpenoid, 1 alpha,4 alpha-dihydroxyeudesman-11-ene (4), along with 12 known terpenoids were isolated from Turraea Pubescens. The structures of the terp...
- Novel bibenzyl derivatives from the tubers of Bletilla striata
[作者：Feng, JQ; Zhang, RJ; Zhao, WM,期刊：Helvetica Chimica Acta, 页码：520-525 , 文章类型： Article，,卷期：2008年91-3]
- Three novel bibenzyl derivatives, blestritins A-C (1-3), along with 18 known constituents, were isolated from the tubers of Bletilla striata (Orchidaceae), a traditional Chinese medicine used for the treatment of tubercu...
- Synthesis and conformational analysis of pentapeptides containing enantiomerically pure 2,2-disubstituted glycines
[作者：Brun, KA; Linden, A; Heimgartner, H,期刊：Helvetica Chimica Acta, 页码：526-558 , 文章类型： Article，,卷期：2008年91-3]
- The synthesis and conformational analysis of model pentapeptides with the sequence Z-Leu-Aib-Xaa-Gln-Valol is described. These peptides contain two 2,2-disubstituted glycines (alpha,alpha-disubstituted alpha-amino acids)...
- An oxidative rearrangement of 6-phenylbicyclo[3.2.0]heptan-6-ol to 1,1'-biphenyl-carbaldehydes: A mechanistic study
[作者：Ceylan, M; Findik, E; Secen, H,期刊：Helvetica Chimica Acta, 页码：559-568 , 文章类型： Article，,卷期：2008年91-3]
- Acid-catalyzed rearrangement of 6-phenylbicyclo[3.2.0]heptan-6-ol gave 1,1'-biphenyl and 1,1'-biphenyl-carbaldehydes in small amounts as well as the expected rearrangement products. A detailed study of the reaction mecha...
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